Machine for machining arcuate surfaces



July 10, 1945. 'E. BARKER MACHINE FOR MACHIN ING ARCUATE SURFACES Filed Nov. 5, 1942 3 Sheets-Sheet 1 July 10, 1945. E; BARKER MACHINE FOR MACHINING ARCUATE SURFACES Filed Nov. 5, 1942 s Sheets-Sheet 2 F r T fi 2% Eu e July 10, 1945. E. BARKER MACHINE FOR MACHINING ARCUATE SURFACES v Filed Nov. 5, 1942 s Sheets-Sheet 3 511L211 Bag-a1- Baw-kefr f. I

Patented July 10, 1945 This invention relates'j to fori liria chining arcuate surfaces and more particularly to millingmachinesand my object is to devise a 1 simple machine for cutting any rdesired radius within a predetermined range, withoutjusing any special forms for. conveying the work to theeut-p trs. A further object isto provideapparatus for automatically controlling the machine so that the operations willbe effected ina minimum oftime.

The invention is hereinafter more-fully described. and is illustrated by way oi example, 1 in the accompanying drawings in which v a Figure 1 is a front view of, a milling achine,

partly bmken away, an P r in t t qr bmbodying my invention; u

the machine; withthe overarmtremovedfi I c Figure 3 a diagrammatical, view transversely of the machine sho ting the mechanism for driv ing the table andthe timing bar; 1 l i Figure 4 a cross-section of the o verarm ,t t v id cutter heads, on an enlarged scale;

Figure 51a longitudinal sectional detail of the driveforthehorizontalcutters; g I

Figureffifla perspective view oi onekpiece of work;

Work; la H Figure 8 a detail plan of a difierent piece of worl; and a mojdified arrangement of cutters;

Figure 9" a cross-sectional detail of y work ihFigureB," v c 7.: l t

Figure 10 a diagrammatic view ef a further piece of work showing the cutters arranged off Figures l and 5; it and the vertical'and horizontaljpositions shown in Figure 111 a diagrammatic view'bftheieed con trol panel. y I m H i In the drawings like numerals of reference indicate the corresponding- .parts in the differ- Y ent figures. t y

I is the frame of the; machine which includes the bed and an overarm 5} suitably supported by the Stanchionsfl'lA horizontal table 61 is pivoted at land is suitably'supported ontheflbed 2 for oscillation thereon' The periphery of the table has rack teeth ilwhich mesh with a pinion 9 on a vertical shaft H! which is rotated by means of a piston rod ll connected with a piston 1 in a hydraulic cylinder 12. rack teeth which mesh with" a second pinion l 3 on the she;

The r ipist on d H has cycle to occur.

fixture 24,which may be FORMACHINING ARCUATE SURFACES Edgar Toronto, Ontario, Canada. AiiplicatidnNoveinber 5, 1942, Serial No. 464,615

it eclaims. (01; -20) piston rod and thus of the table 6 will bevaried.

The rate of speed of the table in either direction of rotation is controlled by any suitable feed control mechanism I4 which causes fluid to be alternately directed into opposite ends of the cylinder l2, the end opposite that being supplied with fluid to be drained, and the rate of how ofthe fluid discharged from the cylinder to be varied. 1 provide a reciprooa bletiming bar i5 and trip dog's l6, adjustably carried thereby, for operating the above control mechanism 14.

The timing bar I5 is reciprocated from the table actuating means so that the baroperates in syhchronism with. the table. Thus as the table swings through an arc of any predetermined length, the mechanism Mis operated fromthe timing bar to cause the next change in the I The timing bar i6 is slidably mounted in brackets ii, for carrying the panel of the feed control mechanism 14, and is provided with rack teeth which mesh with a gear I8 on a spindle l9. 7 The latter is driven byjbevel gears 20 from a cross shaft 2| which is driven,

by bevel gearing 22 from the vertical shaft ID;

Thework 23 may be carried by; any suitable y y y secured by any sutiable means to the table 6. The fixture may have a dove-tailed-connectionwith the table or thelatter may have one or moreT slots, ferreceiving T headed bolts to secure the fixture to the table. The dove-tail on the tableor the slots may extend radially from the pivot 1 or they;

may extend in a non-radial direction. In any case the work is adjustable relative to the pivot It to cut any desired radius Within the usable.

limits of the working area of the tablej A graduated scale maybe provided for use by the operator in setting up the work. A pluralityof surfaces of the work are preferably cut simultaneouslylby milling cutters 25, 26 and 27, The vertical cutter] 25 may bearranged atany suitable angle relative to the surface of the table to cut an arcuate surface at a correspondinganglerelative to the base of thework. Such surface may be concave or convex. The cutter side of the overarm 5and is provided withia manually operable; screw 51 for adjusting the cutter relative to the axis of thetable 6. The cutter is driven by any suitable means from a splined shaft 29.

The horizontal cutters ably parallel to one another and to the surface of the table 6 and are vertically spaced apart to cut the upper andlowersides of the work. These 25 is] carried, by a cutter head 28 which is slidable on one 26and 21 are prefer- 32, 33 which mesh with Worms 34, 35 on a shaft 7 i 35 which is driven by bevel gears 31 from a sleeve 38 splined on a shaft 39. The sleeve slides:

along the shaft 39 as the cutter head is moved along the overarm 5. When the'slide;3 Lismoved relative to the cutter head 30, the WOIlIl Wheel 33 rolls along its worm wherebythe cutter 21 may be driven in any desired position relative to the other cutter 26.

e The-splined shafts 29 and 39 are driven by anysuitable means from an electric motor 40. The pair or set of cutters 26, 21 are at one side ofthe cutter head 30 andare carried by spindles 53, 54 to which are secured the worm wheels 32,

s 33. The spindles also extend through the other side of the cutter head for carryinganother pair or set of cutters 26 21 With this arrangement the cutters 26, 2lwill be used simultaneously with the cutter 25 to mill-a convex surface A and the upper and lower sides B and C of the W01k'23; The other set of cutters 26 2'! will be usedsimultaneously with the cutter 25 to mill a concave surface D and the upper and lower sides E'and Fofthe work 23*. This arrangement of. the two sets of horizontal cutters provides clearancefor the cutter heads which may thus be positioned'at the side of the work remote from the fixture usedto secure the work to the table.

In practice, the table 6 advanced rapidly' from its loadingpositionuntil the work-reacl1 es position.

' The hereinbefore mentioned automatic feed control mechanism l4'is well'known in the art and-includes a plunger M- which when manually operated by a lever 42 establishes communication between a supply pipe 43' anda pipe 48 leading to one end of the' cylinder l2. At the same time the plunger establishes communication between a pipe-'49 connected with the other end of the cylinder and a drain pipe 44. The latter leads to a tank- 45 from which it is pumped to the supply pipe43 by-means of a suitably driven pump Since the timing bar l5'is reciprocated'in syn chronism with the turning table B as hereinbefore-described, the trip dog 16, when the WOIk' reaches the predeterminedpoint near the cutters engages the plunger 41 and depresses it a predetermined-distance whereby the rate oi'discharge from the cylinder is restricted so that thenrate of feed is reduced. The restricted flow is manually adjustable so thatthe table will be rotated at the desired cutting speed; After the work has been moved past the cutters; a trip dog Ili 'onthe bar l5 engages and opens a limit switch 46 carried bythe frame of the machine, A-trip dog lfi also on the bar [5 simultaneously ters, may be used to machine various v kirr actuates the plunger 4| to stop the flow of fluid to the cylinder 12 and thus stop the further feed movement of the table 6. The opening of the limit switch simultaneously causes, first, the

circuit leading to the motor 40 to be broken to stop the cutters 25, 26 and 21; and second, causes .a well known pneumatic electric timing device to pipe 44 and the pipe 48 which causes the travel of the piston: tobe reversed at a rapid-speed wherebythe table will be returned to its initial position at a high rate of speed while the cutters are stopped. The direction of travel of the timing bar I5 is thus also reversed and as it nears its initial position, rnrcuyqog lfi 'engages'the plunger and raises it into its stop?"positionfthus; completing the cycleand stopping all further movements of the table until the lever 42 is again manually operated; The motorf lll is manually' started by a start push buttonandmaybei manually stopped by a stop button 56:] A 7 It will be understood that varifousmodifications may be made withoutdepartingfronr the spirit of my invention. For example, grinding wheels may be substituted "for the 'millin'g 'cutters or the machine may be a-shaperinsteadof almill-f ing machine in whicncase'the cutters'would'not be rotated;- r I It is obvious that various arrangementsof cuta d of" work. For instance, to machine-the faces vG I-1, 1, J and Kof the w'ork'23i3 in Figures'S and 9; t hreef vertical cutters25; 25F andfl2g5 are used; The

two cutters for'the outside faces G and K, are

carried by two heads 30a, 30 which areindependently movable, by separate manually operablescrews 52% 52 along-one side of the, overarm 5r The screw 52 has a; threaded connection.

, with t e a a dna sssiir el h dfi ek opening in the head-30 The other screw'jzlf has a threaded connection with the Otherhead till and-passes freely throu'gl'i'an"opeiiing' infltlie,

head 30? so, that either or both heads mayjbe moved along "thef overarm to suit work ofdi ent widths, 'The'cutterfllfi iforlmachin ng surfaces 'H, I a'ndJ-is' carried by the hereinbeiore described head 28 which is movable alongithe other side of the overarmfiif w 10, the r ki r'has t i cesib. M' machined by' the wtters'zse aq 26 The; axis of the vertical cutterjfi? ispositioned'at an angle to" the vertical" and the axis of the, horizontal? cutter26 is at an an le tothe horina1-:--- a. a 4 i What I claim asmy invention is:

1. A machine ofltheclass describedhavinggacutter,- a pivoted table for carrying work; 7 variable speedme'ans-for turning the table in o'ne: direction of-irotation' to cause the work to be; carried'toa point 'within a short distance o'ff the cutter at'a speed greater thanfthe desiredcutfl ting speed,; th enpast the cutter'at', thedesired;

- ut n s edta i r a er urnin th a 1: inthe; opposite direction of rotation at a speed greater" than the cutting speed to, return the table to its initial position; a reciprocable' timing; a h'ar ur l ty of st rsai iustab t e ure eretq ea in oper ble b thwaii blei s'p'eed means for simultaneouslymovin'g said bar and stops lengthwise in one direction as the table is turned in one direction of rotation and for simultaneously moving said bar and stops lengthwise in the reverse direction when the table is reversed; and means controlledby the said stops for regulating the rate of speed and direction of movement of the variable speed means.

2. A machine of the class described having a cutter, a pivoted table for carrying work; by draulic means for, turning the table; means for regulating the rate of speed and direction of movement of the hydraulic means to vary the turning speed of the table; means for actuating the cutter; means for controlling the regulating means and the cutter actuating means to turn the table in one direction of rotation and convey the work to a point within a short distance of the ting speed, then past the cutter at the desired cutting speed, then stopping the cutter actuating means and causing the table to stop, and

cutter at a speed greater than the desired cuta 

